JENNY FITZGERALD HAS been outside the huddle, trying to fit in to her sports-obsessed family. The only time she knows the score is when she's holding an egg-carton palette and painting on a canvas, but even then she feels as though something is missing.

Unlike her three younger siblings, Jenny knows her biological father only as Donor #142.

As Jenny's 16th summer draws to a close, she feels more alienated than ever. But then a chance meeting with gorgeous über-jock Tate leads Jenny to reach out to someone else who might know exactly how she feels. With Tate by her side, Jenny searches for a genetic relative in the Donor Sibling Registry and discovers that she has a half sister, Alexa. Jenny hopes their budding relationship will fill the gaps in her life, but when Alexa shows up on her doorstep for a surprise visit, the changes in Jenny's world are much bigger than she could ever have imagined.

From the Hardcover edition.

Emily Franklin is the prolific author of the YA series The Principles of Love. She lives in Massachusetts with her husband and young children.